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annotate sw/mcsi-rxtx/ttymagic.c @ 16:f422d19c0118 default tip

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fc-mcsi-rxtx: fix bug in PCM sample Rx
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Oct 2024 01:41:33 +0000
parents 8a386263dd51
children
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7
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1 /*
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2 * This module contains the tty "magic" code for fc-mcsi-rxtx,
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3 * copied from fc-shell and fc-tmsh.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include <termios.h>
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13
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14 extern int ttyhacks;
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15
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16 static struct termios orig_termios, our_termios;
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17
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18 #define MAX_USER_CMD 78
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19 char usercmd[MAX_USER_CMD+1];
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20 int usercmd_len;
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21
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22 void
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23 tty_init()
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24 {
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25 if (!ttyhacks)
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26 return;
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27 tcgetattr(0, &orig_termios);
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28 bcopy(&orig_termios, &our_termios, sizeof(struct termios));
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29 our_termios.c_oflag &= ~(OCRNL | ONOCR | ONLRET);
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30 our_termios.c_lflag &= ~(ICANON | ECHO);
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31 our_termios.c_cc[VMIN] = 1;
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32 our_termios.c_cc[VTIME] = 0;
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33 tcsetattr(0, TCSAFLUSH, &our_termios);
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34 putchar('>');
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35 fflush(stdout);
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36 }
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37
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38 void
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39 tty_cleanup()
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40 {
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41 if (!ttyhacks)
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42 return;
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43 tcsetattr(0, TCSAFLUSH, &orig_termios);
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44 }
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45
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46 void
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47 handle_tty_input()
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48 {
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49 char buf[256];
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50 int i, c, cc;
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51
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52 cc = read(0, buf, sizeof buf);
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53 if (cc <= 0) {
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54 tty_cleanup();
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55 exit(0);
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56 }
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57 for (i = 0; i < cc; i++) {
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58 c = buf[i];
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59 if (c >= ' ' && c <= '~') {
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60 if (usercmd_len >= MAX_USER_CMD)
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61 continue;
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62 usercmd[usercmd_len++] = c;
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63 if (ttyhacks)
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64 putchar(c); /* echo */
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65 continue;
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66 }
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67 switch (c) {
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68 case '\b':
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69 case 0x7F:
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70 if (!usercmd_len)
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71 continue;
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72 usercmd_len--;
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73 if (ttyhacks) {
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74 putchar('\b');
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75 putchar(' ');
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76 putchar('\b');
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77 }
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78 continue;
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79 case '\n':
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80 case '\r':
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81 usercmd[usercmd_len] = '\0';
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82 if (ttyhacks)
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83 putchar('\n'); /* echo */
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84 dispatch_user_cmd();
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85 usercmd_len = 0;
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86 if (ttyhacks)
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87 putchar('>'); /* new prompt */
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88 }
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89 }
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90 }
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91
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92 void
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93 async_msg_output(msg)
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94 char *msg;
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95 {
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96 int msglen, i;
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97
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98 msglen = strlen(msg);
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99 if (ttyhacks)
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100 putchar('\r');
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101 fputs(msg, stdout);
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102 if (ttyhacks)
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103 for (i = msglen; i < usercmd_len + 1; i++)
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104 putchar(' ');
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105 putchar('\n');
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106 if (!ttyhacks)
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107 return;
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108 /* reprint the input line */
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109 putchar('>');
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110 if (!usercmd_len)
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111 return;
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112 fwrite(usercmd, 1, usercmd_len, stdout);
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113 }